Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 42
verging rays are always made more divergent. Ones. Describe the image formed. Ans. It is virtual, erect, and smaller then the object. 2,696 HAWKINS ELECTRICITY Formulae Relating to Lenses.—In all these lenses the re-lations between the distances of the image and object, principalfocus, also radii… … Fig. 3,806.—Spherical aberration. The reflected rays of concave spherical mirrors do not meetat exactly the same point. For instance, the ray AB, will be reflected to F, but DE will bereflected to H, a point closer to the mirror. This is called spherical aberration. It has beenobserved that the…
Electrical engineering
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